package collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * 对整形集合进行排序
 */
public class SortInteger {
    public static void main(String[] args) {
        Random rand = new Random();
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            list.add(rand.nextInt(100));
        }
        System.out.println("list原始数据:" + list);//无序
        Collections.sort(list);//自然排序(从小到大)
        System.out.println("list排序后数据" + list);//有序(从小到大)
        Collections.reverse(list);//反转list集合(数据已经改变了)
        System.out.println("list反转后数据" + list);//有序(从大到小)
        System.out.println("第一个数据" + list.get(0));
    }
}
